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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Korean Society of Steel Construction
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Journal DOI :
Korean Society of Steel Construction
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Volume & Issues
Volume 8, Issue 4 - Dec 1996
Volume 8, Issue 3 - Sep 1996
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A Study on Parameters Affected the Fatigue Crack Growth in Steel Structure Members( II ) -The Effect of Surface Residual Stress for Crack Closure-
Choi, Young Jae ; Kyung, Kab Soo ;
Journal of Korean Society of Steel Construction, volume 8, issue 3, 1996, Pages 3~11
To investigate the effect of fatigue crack growth due to the surface residual stress, it is measured the residual stress distribution by x-ray diffraction at the crack tip each constant crack growth in the notch specimens, and quantitively assessed the effect of crack closure caused to the distribution of compressive stress at the crack tip from evaluating crack openning stress using the finite element analysis. It is concluded that the degree of the residual stress distribution at the crack tip is decreased with increasing the crack length. From the fact that it is similar to the crack openning stress ratio, it is found that the compressive residual stress distribution and size is related to the crack closure effect and surface residual stress field with propagating crack in the notch specimens depends on the stress intensity factor range at the crack tip.
A Study on the Fatigue Strength of a Welded Joint with Misalignment of a U-type Trough Rib in a Steel Deck Plate
Lee, Dong Uk ; Seo, Won Chan ;
Journal of Korean Society of Steel Construction, volume 8, issue 3, 1996, Pages 13~20
With the adoption of welded joints rather than bolted joints, we investigate the fatigue strength and the fatigue crack initiation of U-type trough rib and welded specimen with misalignment in a steel deck plate. The stress concentration factor of welded specimens with a misalignment is also verified by a finite element method. The main conclusions obtained from this study are as follows Experimental results of full-scaled U-type trough rib models have indicated that fatigue life depends on misalignments of welded joints in steel deck plate ; The more misalignments are, the less the fatigue life is. It has also shown that fatigue crack propagates from the welded root to the bead surface. We have also obtained the same results from both the fatigue test of welded specimens with a misalignment and the stress analysis of a finite element method.
An Iterative Method for Natural Frequency and Mode Shape Sensitivities
JUNG, GH ; JUNG, HJ ; OH, JW ; LEE, IW ;
Journal of Korean Society of Steel Construction, volume 8, issue 3, 1996, Pages 21~34
A numerical method is presented for computation of eigenvector derivatives used an iterative procedure with guaranteed convergence. An approach for treating the singularity in calculating the eigenvector derivatives is presented, in which a shift in each eigenvalue is introduced to avoid the singularity. If the shift is selected properly, the proposed method can give very satisfactory results after only one iteration. A criterion for choosing an adequate shift, dependent on computer hardware is suggested ; it is directly dependent on the eigenvalue magnitudes and the number of bits per numeral of the computer. Another merit of this method is that eigenvector derivatives with repeated eigenvalues can be easily obtained if the new eigenvectors are calculated. These new eigenvectors lie "adjacent" to the m (number of repeated eigenvalues) distinct eigenvectors, which appear when the design parameter varies. As an example to demonstrate the efficiency of the proposed method in the case of distinct eigenvalues, a cantilever plate is considered. The results are compared with those of Nelson's method which can find the exact eigenvector derivatives. For the case of repeated eigenvalues, a cantilever beam is considered. The results are compared with those of Dailey's method which also can find the exact eigenvector derivatives. The design parameter of the cantilever plate is its thickness, and that of the cantilever beam its height.
An Experimental Study on the Behavior of Square Hollow Steel Section T-joints to be fillet-welded without Reinforcement
Bae, Kyu-Woong ; Moon, Tae-Sup ;
Journal of Korean Society of Steel Construction, volume 8, issue 3, 1996, Pages 35~45
The purpose of this paper is to investigate experimentally the strength and deformation of T-joints to improve the structural behavior of truss connection consisted in square hollow steel section. There are two-types to be changed in T-joint shape. One type is TP-series that a brace member is rotated to 45 degree, another type is TR-series that a chord member is rotated to 45 degree. The most important results obtained from the 2nd experiment on the T-joints is as follow; The yielding strength and initial stiffness of TP-series increase more than a current type(TS-series) in
A Study on the Rolling Resistance of Trains through real Measurement
CHANG, Dong Il ; LEE, Sung Uk ;
Journal of Korean Society of Steel Construction, volume 8, issue 3, 1996, Pages 47~54
Recently Sucessive progress in train technic has enabled us to constructed high-speed railways for ourselves. This caused more rapid train more pressure on a track and speedier track break-down. Especially in the construction of high-speed rails for high-speed traveling and safety accurate breaking distance is essential and not only computation of rolling resistance in theory but also verification through real measurement are important in basic material for breaking and starting load caused during the train running. In this study, we measured traveling resistance and calculated traveling resistance formula in the case of the SAEMA-EUL which consists of main part of current passenger trains and frights in this country.
Stability Analysis of Stiffened Thin Plates Using Energy Method
KIM, Moon Young ; MIN, Byoung Cheol ;
Journal of Korean Society of Steel Construction, volume 8, issue 3, 1996, Pages 55~65
For stability analysis of stifened rectangular thin plates with various boundary conditions, Ritz method is presented. An energy method is especially useful in those cases where a rigorous solution of the diferential eqution is unknown or where we have a plate reinforced by stiffeners and it is required to find only an approximate value of the critical load. The strain energy due to the plate bending and the work done by the in-plane forces are taken into account in order to apply the principle of the minimum potential energy. The buckling mode shapes of flexural beams with various boundary conditions are derived, and shape functions consistent with the given boundary conditions in the two orthogonal directions are chosen from those displacement functions of beams. The matrix equations for stability of stiffened rectangular thin plates are determined from the stationary condition of the total potential energy. Numerical example for stability behaviors of horizontally and vertically stiffened plates subjected to uniform compression, bending and shear loadings are presented and the obtained results are compared with other researchers' results.
A Study on the Structural Behavior of the Composite Slabs using the Metal Form Deck Plate
KWON, Yong Keun ; KANG, Do An ; CHOI, Sung Mo ; EOM, Chul Hwan ; CHOI, Oan Chul ; MOON, Tae Sup ; KIM, Kyu Suk ; KIM, Duck Jae ; KIM, Dong Kyu ;
Journal of Korean Society of Steel Construction, volume 8, issue 3, 1996, Pages 67~78
This paper provides the results of a study on the structural behavior of the composite slabs using the metal form deck plate. Cold-formed steel deck sections are used in many composite floor slab applications wherein the steel deck serves not only as the form for the concrete during construction but also as the principal tensile reinforcement for the bottom fiber of the composite slab. A total of 16 specimens are tested to clarify the composite action between the concrete and metal deck plate and to find the method to increase the composite effect, whether or not non-slip bars are used. The test results are summarized for the shear-bond capacities, deformation capacities, and failure modes for the specimens.
Elastica of Tapered Columns of Regular Polygon Cross-Section with Constant Volume
LEE, Byoung Koo ; OH, Sang Jin ; MO, Jeong Man ;
Journal of Korean Society of Steel Construction, volume 8, issue 3, 1996, Pages 79~87
Tensile Behavior of Concrete-Filled Column Connections Using Re-bars
LEE, Young Ryule ; YOO, Yeong Chan ; SHIN, Kyung Jae ; OH, Young Suk ; LEE, Seung Joon ; MOON, Tae Sup ;
Journal of Korean Society of Steel Construction, volume 8, issue 3, 1996, Pages 89~96
The objective of this study is to investigate the structural behavior of Concrete-Filled Steel Tubular Column connections using reinforced bar. The parameter of specimens is the area of each reinforced bar (SD40 : D13, D16, D19, D22, D25). The simple tensile experiment is conducted to 5 kinds of specimens. Estimating the load, displacement, and strain from each kind, we compared them to basic elementary type (Flange Type, Basic Type, DPA Type, DPB Type). In each specimen, We can get the yielding load obtained by the theoretical three failure modes which make it possible to predict the experimental results. Actually, through the comparison and analysis, we come to know that the experimental results and theoretical results are nealy the same. Further, we will exert to apply the connections using reinforced bar to construction of high-rise building.
Synthesis of Earthquake Ground Motion by Combining Stochastic Line Source Model with Elastic Wave Propagation Analysis Method in a Layered Half Space
KIM, Jae Kwan ; KWON, Ki Jun ;
Journal of Korean Society of Steel Construction, volume 8, issue 3, 1996, Pages 97~105
A Stochastic line source model is developed to simulate the seismic wave field generated during the rupture propagation process along a fault plane of which length is much larger than its width. The fault plane is assumed to consist of randomly distributed slip zones and barriers and each slip zone is modeled as a point source. By combining the newly developed source model with wave propagation analysis method in a layered 3-D visco-elastic half space, synthetic seismograms are obtained. The calculated accelerograms due to vertical dip slip and strike slip line sources are presented.
An Experimental Studies on the Fatigue Behavior of Preflex Girder
CHANG, Dong Il ; Lee, Myeong Gu ; LEE, Seung Yong ;
Journal of Korean Society of Steel Construction, volume 8, issue 3, 1996, Pages 107~116
The studies are conducted to investigate the fatigue and fracture, behavior of preflex girder. In this work, the fatigue tests using by constant amplitude fatigue loading and 4-point-loading to maintain pure bending condition in the mid-span of preflex girder will be performed. It is expected from the results of the studies to provide the fatigue strength and the S-N curve of preflex girders. In addition, it will be ensured that fracture initiation occurs in the welded part of horseshoe-type shear connector as well as in other welded joints.
A Study on the Detail of Vertical Stiffener of Plate Girder
KYUNG, Kab Soo ;
Journal of Korean Society of Steel Construction, volume 8, issue 3, 1996, Pages 117~125
The stress patterns of vertical stiffener of plate girder bridge were examined by existing data of actual measurement stress for steel bridges and the structural details of vertical stiffener of plate girder bridge having seeked rationalization and abbreviation were investigated by 1/2 bridge model. As the results, the out-of-plane stress occur in the upper parts of vertical stiffner and fatigue cracks by the action of alternative stress is apt to occur in web plate of lower parts vertical stiffener. Also, the gap between lower parts of vertical stiffner and lower flange of plate girder bridge seeking rationalization and abbreviation is effective to adopt 100mm.
A Study on the Flexibility of Semi-Rigid Steel Frames under Lateral Loadings( I )
KANG, Cheol Kyu ; HAN, Young Cheol ; LEE, Gag Jo ;
Journal of Korean Society of Steel Construction, volume 8, issue 3, 1996, Pages 127~137
Connections as basic elements and an integrated part of a steel frame has an effect on the frame's performance. Conventional analysis and design techniques are based on either idealized fixed or pinned conditions. In fact, the use of rigid or pinned connection model in steel frame analysis serves the purpose of simplifying the analysis and design processes, but all connections used in current pratice possess stiffness and transfer moment which fall between the extreme cases of fully rigid and ideally pinned. To predict the behavior of the semi-rigid steel frames, it is necessary to predict the moment-rotation behavior of the beam-to-column connections. In this research, prediction equation for moment-rotation behavior of the beam-to-column connection is suggested and the effect of design parameters has investigated. Prediction model, in a nondimensional form shows the moment-rotation characteristic for connections. It is composed of the curve fitting power function using standardization constant K and 4 parameter
, b, n based on the pretest result about moment-rotation behavior of connection.
A Comparison Study for the Fatigue Behavior of H/T and T/S Bolt Friction Joint
JUN, Je Sang ; WOO, Sang Ik ; LEE, Seong Heang ; JUNG, Kyoung Sup ;
Journal of Korean Society of Steel Construction, volume 8, issue 3, 1996, Pages 139~150
H/T(High Tension) bolt is generally being used in joining the members of steel structure. It has some difficulties in management such as an adequate fastening force and a selection of proper instrument for fastening. T/S(Torque Shear Type High Tension) bolt which is more convenient and easier than H/T bolt in quality control has recently been developed. T/S bolts are produced and widely used these days in domestic, but those have not a detail regulation for their on. Those are only being used according to the specification for the H/T bolts. In this study, we tried to confirm the soundness of T/S bolts by the fatigue test of the modified specimens. First, we measured the reduction rate of the initial axial force with time at bolts. Second, we investigated the slip forces of bolts when the test specimen is loaded in tension. Third, we implemented the fatigue tests. During the test, we measured the variation of the axial forces of bolts under the cyclic loading. Finally, we compared and analyzed the fatigue behavior of H/T and T/S bolt, by S-N curve diagrams that are obtained in this study.
An Experimental Study on the Fatigue Behavior of Torque Shear Type High Tension Bolted Joints
CHANG, Dong Il ; Lee, Sung Uk ;
Journal of Korean Society of Steel Construction, volume 8, issue 3, 1996, Pages 151~160
The fatigue test under the constant amplitude repeated loading is performed to investigate the fatigue behavior of the Torque Shear type high tension bolted joint which is able to manage the axial force uniformly. From the test results, it's known that the reduction of the axial force of T/S bolt followed by the elasped time is similar to that of the high tension bolts. The difference of relaxation is not occurred according to the position of bolts, the size of the introduced axial force but the effect of the variation of temperature is large. In the reduction of the axial force followed by the cumulation of the fatigue load, the outer bolt is larger than the inner bolt. This result depends on the difference in the distribution of the non-slip zone. The variation of the surface roughness affects the slip and the reduction of the anal force.